Face milling

Engage and disengage angles

Figure shows the angle at which the cutting edge enters the workpiece, the engage angle (E), and the angle at which it disengages the workpiece, disengage angle (DE). The engage and disengage angles are factors that determine the degree of impact that the cutting edge is exposed to when cut starts and finishes. The engage and disengage angles relate to tool life and need to be carefully considered.